Constitutive equations of magnetostrictive smart materials involving mechanical and magnetic fields are presented via Hamilton’s principle. Finite element equations are used to solve the equations of motion subjected to different force inputs. Magnetostrictive (CoFe2O4) layers mounted on the root of cantilever beam is considered as the case study to obtain the displacement and magnetic response...

We analyze the possibility of detecting weak magnetic fields by using magnetostrictive perturbation of optical fibers. The basic scheme is demonstrated in Fig. 1. A low-loss optical fiber of length L is sheathed in a magnetostrictive jacket that undergoes a longitudinal strain (magnetostriction) when immersed in a magnetic field. This strain affects the phase delay of a laser light beam propaga...

Cryogenic magnetostrictive materials, such as rare earth zinc crystals, offer high strains and high forces with minimally applied magnetic fields, making the material ideally suited for deformable optics applications. For cryogenic temperature applications, such as Next Generation Space Telescope (NGST), the use of superconducting magnets offer the possibility of a persistent mode of operation,...

We calculate the effective properties of a magnetostrictive composite in the dilute limit. The composite consists of well separated identical ellipsoidal particles of magnetostrictive material, surrounded by an elastic matrix. The free energy of the magnetostrictive particles is computed using the constrained theory of DeSimone and James [2002. A constrained theory of magnetoelasticity with app...

A magnetostrictive FeNi-coated surface acoustic wave (SAW)-based current sensor was proposed in this work. The weak remanence and hysteresis effect of the FeNi itself contributes to suppress the asymmetry in sensor response at increasing and decreasing current. The sensor response was simulated by solving the coupled electromechanical field equation in layered structure considering the magnetos...

PURPOSE To compare patients' perception of discomfort, vibration and noise levels between piezoelectric and the magnetostrictive ultrasonic units during periodontal debridement. METHODS Periodontal debridement was performed on 75 subjects using a split-mouth design. Two quadrants on the same side were instrumented with a piezoelectric ultrasonic device (EMS Swiss Mini Master® Piezon) and the ...

Recent results on the development and implementation of a novel technology for lung tumor detection and imaging is presented. This technology offers high-sensitivity imaging of magnetic nanoparticles to provide specific diagnostic images of early lung tumors and potential distant metastases. Recent developments in giant magnetostrictive (GMS) or magnetic shape memory (MSM) materials have led to...

Condition assessment of cables has gained considerable attention for the bridge safety. A magnetic flux leakage and magnetostrictive guided wave hybrid transducer is provided to inspect bridge cables. The similarities and differences between the two methods are investigated. The hybrid transducer for bridge cables consists of an aluminum framework, climbing modules, embedded magnetizers and a r...

Development of Apple Workgroup Cluster and Parallel Computing for Phase Field Model of Magnetic Materials. (May 2009) Yongxin Huang, B.S., University of Science and Technology of China Chair of Advisory Committee: Dr. Yongmei Jin Micromagnetic modeling numerically solves magnetization evolution equation to process magnetic domain analysis, which helps to understand the macroscopic magnetic prop...